M29W128 データシートの表示（PDF） - Numonyx -> Micron

部品番号

コンポーネント説明

メーカー

M29W128

128 Mbit 3V Supply Flash Memory

Numonyx -> Micron 

Command interface

5

Command interface

M29W128FH, M29W128FL

All Bus Write operations to the memory are interpreted by the Command Interface.

Commands consist of one or more sequential Bus Write operations. Failure to observe a

valid sequence of Bus Write operations will result in the memory returning to Read mode.

The long command sequences are imposed to maximize data security.

The address used for the commands changes depending on whether the memory is in 16-

bit or 8-bit mode.

5.1

5.1.1

5.1.2

5.1.3

Standard commands

See either Table 9, or Table 10, depending on the configuration that is being used, for a

summary of the Standard commands.

Read/Reset command

The Read/Reset command returns the memory to Read mode. It also resets the errors in

the Status Register. Either one or three Bus Write operations can be used to issue the

Read/Reset command.

The Read/Reset command can be issued, between Bus Write cycles before the start of a

program or erase operation, to return the device to Read mode. If the Read/Reset command

is issued during the time-out of a Block erase operation, the memory will take up to 10µs to

abort. During the abort period no valid data can be read from the memory.

The Read/Reset command will not abort an Erase operation when issued while in Erase

Suspend.

Auto Select command

The Auto Select command is used to read the Manufacturer Code, the Device Code, the

Protection Status of each block (Block Protection Status) and the Extended Memory Block

Protection Indicator.

Three consecutive Bus Write operations are required to issue the Auto Select command.

Once the Auto Select command is issued Bus Read operations to specific addresses output

the Manufacturer Code, the Device Code, the Extended Memory Block Protection Indicator

and a Block Protection Status (see Table 9 and Table 10 in conjunction with Table 3, Table 4,

Table 6 and Table 7). The memory remains in Auto Select mode until a Read/Reset or CFI

Query command is issued.

Read CFI Query command

The Read CFI Query Command is used to put the memory in Read CFI Query mode. Once

in Read CFI Query mode, Bus Read operations to the memory will output data from the

Common Flash Interface (CFI) Memory Area. One Bus Write cycle is required to issue the

Read CFI Query Command. This command is valid only when the device is in the Read

Array or Auto Select mode.

The Read/Reset command must be issued to return the device to the previous mode (the

Read Array mode or Auto Select mode). A second Read/Reset command is required to put

the device in Read Array mode from Auto Select mode.

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